Spreadsheet Pro for Solar Product Calculator Dashboard

Spreedsheet expert to build dasboard for mysolar digital product excel sheet calculators for reussble protected sheetsSolarToolkit Pro — a professional digital product (handbook + Excel calculators) for solar installers, engineers, and serious homeowners in Nigeria and Africa.
I need an experienced Excel specialist to design and build a set of clean, professional, user-friendly, and well-protected calculators/templates that form the core of the product.
What I Need Built
A suite of interconnected or standalone Excel workbooks covering:
Solar Panel / Array Sizing Calculator
Daily load calculation (Nigerian appliances with realistic wattages)
Peak sun hours by location (Lagos and major Nigerian cities)
System losses, orientation, and recommended array size (kWp)
Battery Bank Sizing Calculator (LiFePO4 focused)
Autonomy days, DoD, efficiency, temperature factors
Usable capacity and recommended battery size (kWh)
Cable Sizing Calculator
Voltage drop, current, distance, cable size recommendations (Nigerian copper cable context)
Hybrid System Overview / Matching Tool
Matching inverter size, battery, and solar array
Basic runtime estimates under different load scenarios
Additional supporting sheets (if time allows)
Simple load list template
Quotation summary sheet
Clear instruction / how-to-use tab